Curious Bowl - Has anyone else seen one of these - raku

Hallo all.
The wonderful turquoise in this bowl caught my eye, but on closer examination I realised there are two separate materials making up the bowl. This strikes me as quite a difficult process to achieve. Initially I thought the rim was metallic as it looks to be covered in rust. However, I'm now not sure as its very light for metal and it feels ceramic. Sadly there are no obvious marks.
I realise this might be a common bowl produced in somewhere like India, but I would be interested if anyone else has seen one of these. It is 6.5" in diameter and I'm toying with the idea of cleaning the rim...somehow.
Thank you for any help you can offer.
Jack.

It's raku, but without a mark it may be a while before it's IDed.

Thank you for the information Naomi.
Just out of curiosity, do you think the two pieces were made separately and then joined, or that somehow one aspect was made, cooled, added to and then fired under a lower heat? The more i think about it, the harder this piece seems to have been to make!

Im afraid I don’t know. John Dunn made raku bowls with a similar blue glaze. I guess it’s just the difference between glazed and unglazed after firing

It was made as one piece.

Thanks Naomi, the John Dunn suggestion is interesting: he's made some lovely pieces.

Thank you studio-pots, thats good to know. What a great skill, the two aspects of this bowl are so profoundly different.

Although I would find it difficult to do, having seen it done, it isn't as skilful as many other aspects of making/decorating studio pottery. In fact Western raku firing is generally regarded as a process where you can achieve attractive results quite easily when compared to all other types of firing.